New York Times reporter Elisabeth Rosenthal discusses the latest in her series “Paying til It Hurts,” about the high cost of health care in the United States compared to other developed countries. She’ll talk about the cost of emergency room care and looks at how ambulances, once free, now operate as businesses and contribute to America’s medical bills. Her latest stories in the series are “Think the E.R. Is Expensive? Look at How Much It Costs to Get There” and “As Hospital Prices Soar, a Stitch Tops $500.”